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. Analysis of new detrital apatite fission-track (AFT) agesfrom modern river sands, published bedrock and detrital AFT ages, andbedrock apatite (U-Th)/He (AHe) ages from the Northern Apennines provides newinsights into the spatial and temporal patterns of erosion rates through timeacross the orogen. The pattern of time-averaged erosion rates derived fromAHe ages from the Ligurian side of the orogen illustrates slower erosionrates relative to AFT rates from the Ligurian side and relative to AHe ratesfrom the Adriatic side. These results are corroborated by an analysis ofpaired AFT and AHe thermochronometer samples, which illustrate that erosionrates have generally increased through time on the Adriatic side but havedecreased through time on the Ligurian side. Using an updated kinematicmodel of an asymmetric orogenic wedge, with imposed erosion rates on theLigurian side that are a factor of 2 slower relative to the Adriatic side,we demonstrate that cooling ages and maximum burial depths are able toreplicate the pattern of measured cooling ages across the orogen andestimates of burial depth from vitrinite reflectance data. These resultssuggest that horizontal motion is an important component of the overall rockmotion in the wedge, and that the asymmetry of the orogen has existed for atleast several million years.

Exhumation and erosion of the Northern Apennines, Italy: new insights from low-temperature thermochronometers